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Planck photon distribution

For photons in thermal equilibrium at temperature

T

, the number density per frequency interval is

\frac{d n}{d ν} = \frac{8 π ν ^{2}}{c ^{3}} \frac{1}{e ^{h ν / (k_{B} T)} - 1} .

Table of contents 38 1
- Temperature scaling of thermal photon number and energy densities Planck photon distribution 21

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